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From: Josef Lusticky <josef@lusticky.cz>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH 1/2] drm/panel: Add Ilitek ILI9341 parallel RGB panel driver
Date: Tue, 19 Feb 2019 14:21:00 +0100
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---
 MAINTAINERS                                  |   6 +
 drivers/gpu/drm/panel/Kconfig                |   7 +
 drivers/gpu/drm/panel/Makefile               |   1 +
 drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 320 +++++++++++++++++++
 4 files changed, 334 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c

diff --git a/MAINTAINERS b/MAINTAINERS
index df5668bc1c88..ec366473174b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4800,6 +4800,12 @@ S:	Maintained
 F:	drivers/gpu/drm/tinydrm/ili9225.c
 F:	Documentation/devicetree/bindings/display/ilitek,ili9225.txt
 
+DRM DRIVER FOR ILITEK ILI9341 PANELS
+M:	Josef Lusticky <josef@lusticky.cz>
+S:	Maintained
+F:	drivers/gpu/drm/panel/panel-ilitek-ili9341.c
+F:	Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
+
 DRM DRIVER FOR HX8357D PANELS
 M:	Eric Anholt <eric@anholt.net>
 T:	git git://anongit.freedesktop.org/drm/drm-misc
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 3e070153ef21..0e2ceea5009a 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -46,6 +46,13 @@ config DRM_PANEL_ILITEK_IL9322
 	  Say Y here if you want to enable support for Ilitek IL9322
 	  QVGA (320x240) RGB, YUV and ITU-T BT.656 panels.
 
+config DRM_PANEL_ILITEK_IL9341
+	tristate "Ilitek ILI9341 240x320 panels"
+	depends on OF && SPI
+	help
+	  Say Y here if you want to enable support for Ilitek IL9341
+	  QVGA (240x320) RGB panel.
+
 config DRM_PANEL_ILITEK_ILI9881C
 	tristate "Ilitek ILI9881C-based panels"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index e7ab71968bbf..1df564018bc4 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_DRM_PANEL_ARM_VERSATILE) += panel-arm-versatile.o
 obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
 obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_IL9341) += panel-ilitek-ili9341.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
 obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
new file mode 100644
index 000000000000..51ed03140f8d
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -0,0 +1,320 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Ilitek ILI9341 drm_panel driver
+ * 240RGBx320 dots resolution TFT LCD display
+ *
+ * This driver support the following panel configurations:
+ * - 18-bit parallel RGB interface
+ * - 8-bit SPI with Data/Command GPIO
+ *
+ * Copyright (C) 2019 Josef Lusticky <josef@lusticky.cz>
+ *
+ */
+
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+
+/* ILI9341 extended register set */
+#define ILI9341_IFMODE         0xB0 // clock polarity
+#define ILI9341_IFCTL          0xF6 // interface conrol
+#define ILI9341_PGAMCTRL       0xE0 // positive gamma control
+#define ILI9341_NGAMCTRL       0xE1 // negative gamma control
+
+#define ILI9341_MADCTL_MV      BIT(5)
+#define ILI9341_MADCTL_MX      BIT(6)
+#define ILI9341_MADCTL_MY      BIT(7)
+
+/**
+ * struct ili9341_config - the display specific configuration
+ * @width_mm: physical panel width [mm]
+ * @height_mm: physical panel height [mm]
+ */
+struct ili9341_config {
+	u32 width_mm;
+	u32 height_mm;
+};
+
+struct ili9341 {
+	const struct ili9341_config *conf;
+	struct drm_panel panel;
+	struct spi_device *spi;
+	struct backlight_device *backlight;
+	struct gpio_desc *dc_gpio;
+	struct gpio_desc *reset_gpio;
+};
+
+static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
+{
+	return container_of(panel, struct ili9341, panel);
+}
+
+static int ili9341_spi_write_command(struct ili9341 *ili, u8 cmd)
+{
+	struct spi_transfer xfer = {
+		.tx_buf = &cmd,
+		.bits_per_word = 8,
+		.len = 1
+	};
+	struct spi_message msg;
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+
+	gpiod_set_value(ili->dc_gpio, 0);
+
+	return spi_sync(ili->spi, &msg);
+}
+
+static int ili9341_spi_write_data(struct ili9341 *ili, u8 *data, size_t size)
+{
+	struct spi_transfer xfer = {
+		.tx_buf = data,
+		.bits_per_word = 8,
+		.len = size
+	};
+
+	struct spi_message msg;
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+
+	gpiod_set_value(ili->dc_gpio, 1);
+
+	return spi_sync(ili->spi, &msg);
+}
+
+#define ili9341_spi_write(ili, cmd, data...) \
+({ \
+	u8 d[] = { data }; \
+	ili9341_spi_write_command(ili, cmd); \
+	if (ARRAY_SIZE(d) > 0) \
+		ili9341_spi_write_data(ili, d, ARRAY_SIZE(d)); \
+})
+
+static int ili9341_deinit(struct drm_panel *panel, struct ili9341 *ili)
+{
+	ili9341_spi_write(ili, MIPI_DCS_SET_DISPLAY_OFF);
+	ili9341_spi_write(ili, MIPI_DCS_ENTER_SLEEP_MODE);
+	msleep(5);
+	return 0;
+}
+
+static int ili9341_init(struct drm_panel *panel, struct ili9341 *ili)
+{
+	/* HW / SW Reset display and wait */
+	if (ili->reset_gpio) {
+		gpiod_set_value(ili->reset_gpio, 0);
+		usleep_range(20, 1000);
+		gpiod_set_value(ili->reset_gpio, 1);
+	} else {
+		ili9341_spi_write(ili, MIPI_DCS_SOFT_RESET);
+	}
+	msleep(120);
+
+	/* Polarity */
+	ili9341_spi_write(ili, ILI9341_IFMODE, 0xC0);
+
+	/* Interface control */
+	ili9341_spi_write(ili, ILI9341_IFCTL, 0x09, 0x01, 0x26);
+
+	/* Pixel format */
+	ili9341_spi_write(ili, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_18BIT << 4);
+
+	/* Gamma */
+	ili9341_spi_write(ili, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
+	ili9341_spi_write(ili, ILI9341_PGAMCTRL,
+		0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
+		0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
+	ili9341_spi_write(ili, ILI9341_NGAMCTRL,
+		0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
+		0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
+
+	/* Rotation */
+	ili9341_spi_write(ili, MIPI_DCS_SET_ADDRESS_MODE, ILI9341_MADCTL_MX);
+
+	/* Exit sleep mode */
+	ili9341_spi_write(ili, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(120);
+
+	ili9341_spi_write(ili, MIPI_DCS_SET_DISPLAY_ON);
+
+	return 0;
+}
+
+static int ili9341_unprepare(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	return ili9341_deinit(panel, ili);
+}
+
+static int ili9341_prepare(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	int ret;
+
+	ret = ili9341_init(panel, ili);
+	if (ret < 0)
+		ili9341_unprepare(panel);
+	return ret;
+}
+
+static int ili9341_enable(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	return backlight_enable(ili->backlight);
+}
+
+static int ili9341_disable(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	return backlight_disable(ili->backlight);
+}
+
+static const struct drm_display_mode prgb_240x320_mode = {
+	.clock = 6350,
+
+	.hdisplay = 240,
+	.hsync_start = 240 + 10,
+	.hsync_end = 240 + 10 + 10,
+	.htotal = 240 + 10 + 10 + 20,
+
+	.vdisplay = 320,
+	.vsync_start = 320 + 4,
+	.vsync_end = 320 + 4 + 2,
+	.vtotal = 320 + 4 + 2 + 2,
+
+	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED
+};
+
+static int ili9341_get_modes(struct drm_panel *panel)
+{
+	struct drm_connector *connector = panel->connector;
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(panel->drm, &prgb_240x320_mode);
+	drm_mode_set_name(mode);
+
+	mode->width_mm = ili->conf->width_mm;
+	mode->height_mm = ili->conf->height_mm;
+
+	strncpy(connector->display_info.name, "ILI9341 TFT LCD driver\0",
+		DRM_DISPLAY_INFO_LEN);
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	connector->display_info.bus_flags |= DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_POSEDGE |
+		DRM_BUS_FLAG_SYNC_NEGEDGE;
+
+	drm_mode_probed_add(connector, mode);
+
+	return 1; /* Number of modes */
+}
+
+static const struct drm_panel_funcs ili9341_drm_funcs = {
+	.disable = ili9341_disable,
+	.unprepare = ili9341_unprepare,
+	.prepare = ili9341_prepare,
+	.enable = ili9341_enable,
+	.get_modes = ili9341_get_modes,
+};
+
+static int ili9341_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ili9341 *ili;
+	int ret;
+
+	ili = devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL);
+	if (!ili)
+		return -ENOMEM;
+
+	spi_set_drvdata(spi, ili);
+
+	ili->spi = spi;
+
+	/*
+	 * Every new incarnation of this display must have a unique
+	 * data entry for the system in this driver.
+	 */
+	ili->conf = of_device_get_match_data(dev);
+	if (!ili->conf) {
+		DRM_DEV_ERROR(dev, "missing device configuration\n");
+		return -ENODEV;
+	}
+
+	ili->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ili->reset_gpio)) {
+		DRM_DEV_ERROR(dev, "failed to get reset gpio\n");
+		return PTR_ERR(ili->reset_gpio);
+	}
+
+	ili->dc_gpio = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(ili->dc_gpio)) {
+		DRM_DEV_ERROR(dev, "failed to get dc gpio\n");
+		return PTR_ERR(ili->dc_gpio);
+	}
+
+	ili->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(ili->backlight)) {
+		DRM_DEV_ERROR(dev, "failed to get backlight\n");
+		return PTR_ERR(ili->backlight);
+	}
+
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		DRM_DEV_ERROR(dev, "spi setup failed\n");
+		return ret;
+	}
+
+	drm_panel_init(&ili->panel);
+	ili->panel.dev = dev;
+	ili->panel.funcs = &ili9341_drm_funcs;
+
+	return drm_panel_add(&ili->panel);
+}
+
+static int ili9341_remove(struct spi_device *spi)
+{
+	struct ili9341 *ili = spi_get_drvdata(spi);
+
+	drm_panel_remove(&ili->panel);
+
+	ili9341_disable(&ili->panel);
+	ili9341_unprepare(&ili->panel);
+
+	return 0;
+}
+
+static const struct ili9341_config dt024ctft_data = {
+	.width_mm = 37,
+	.height_mm = 49,
+};
+
+static const struct of_device_id ili9341_of_match[] = {
+	{ .compatible = "displaytech,dt024ctft", .data = &dt024ctft_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ili9341_of_match);
+
+static struct spi_driver ili9341_driver = {
+	.probe = ili9341_probe,
+	.remove = ili9341_remove,
+	.driver = {
+		.name = "panel-ilitek-ili9341",
+		.of_match_table = ili9341_of_match,
+	},
+};
+module_spi_driver(ili9341_driver);
+
+MODULE_AUTHOR("Josef Lusticky <josef@lusticky.cz>");
+MODULE_DESCRIPTION("ILI9341 LCD panel driver");
+MODULE_LICENSE("GPL");

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From: Josef Lusticky <josef@lusticky.cz>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH 2/2] dt-bindings: panel: Add Ilitek ILI9341 panel
 documentation
Date: Tue, 19 Feb 2019 14:21:01 +0100
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---
 .../bindings/display/panel/ilitek,ili9341.txt | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt b/Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
new file mode 100644
index 000000000000..4e0e483bc12e
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
@@ -0,0 +1,33 @@
+Ilitek ILI9341 TFT panel driver with SPI control bus
+
+This is a driver for 240x320 TFT panels with parallel RGB color input.
+
+Required properties:
+  - compatible: "displaytech,dt024ctft", "ilitek,ili9341"
+  - backlight: phandle of the backlight device attached to the panel
+
+Optional properties:
+  - dc-gpios: a GPIO spec for the Data/Command pin, see gpio/gpio.txt
+  - reset-gpios: a GPIO spec for the reset pin, see gpio/gpio.txt
+
+The panel must obey the rules for a SPI slave device as specified in
+spi/spi-bus.txt
+
+The device node can contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in
+media/video-interfaces.txt. This node should describe panel's video bus.
+
+Example:
+
+panel@0 {
+	compatible = "displaytech,dt024ctft", "ilitek,ili9341";
+	reg = <0>;
+	backlight = <&backlight>;
+	dc-gpios = <&pio 4 9 GPIO_ACTIVE_HIGH>;
+
+	port {
+		panel_in: endpoint {
+			remote-endpoint = <&display_out>;
+		};
+	};
+};